Independent rotation for percussive tools



F. M. SLATER. INDEPENDENT ROTATION FOR PERCUSSIVE TOOLS.

APPLICATION FILED MAR 18, I920. 1,370,923.

Patented Mar. 8, 1921..

INV NTOR.

20 T W AT'TO NEYV UNITED STATES FRED M. SLATER,

OF EASTON, PENNSYLVANIA, PANY, OF JERSEY CITY, NEW JERSEY,

ASSIGNOR TO INGERSOLL-RAND CO]!!- A CORPORATION OF NEW JERSEY.

INDEPENDENT ROTATION FOR PERCUSSIVE TOOLS.

Specification of Letters Patent.

Patented Mar. 8, 192-1.

Application filed March 18, 1920. Serial No. 367,014.

T 0 all w 720m it may concern:

Be it known that I, FRED M. SLATER, a citizen of the United States, residing at Easton, in the county of Northampton and State of Pennsylvania, have invented a certain new and useful Improvement in Independent Rotations for Percussive Tools, of which the following is a specification.

This invention relates to fluid actuated percussive tools of the hammer drill type but more particularly to means independent of the piston for imparting rotation to the drill steel.

The objects of the invention are to improve and simplify the rotating means including the construction of the cylinder and the motor casing mounted thereon, and enable the motor to be simply and efficiently constructed at minimum cost, readily and quickly mounted or taken apart, and conveniently and seemingly held in position and alinement on the cylinder of the tool.

The invention as illustrated in one of its referred forms in the accompanying drawings in wh' Figure l, is a top plan view of a tool partly broken away and partly in horizon tal section on the line 1-1 of Fig. 2.

Fig. 2 is a side elevation partly broken away and partly in longitudinal section, and

Fig. 3 is an enlarged detail transverse sec tional view on the line 3-3 of Fig. 2 looking in the direction of the arrows.

Referring to the drawings, A represents the cylinder casing of a fluid actuated percussive tool having a hammer piston adapted to reciprocate in the cylinder chambers for striking the drill steel C, held in a rotation sleeve D within the front head E which is suitably clamped to the cylinder casing as by means of the spring pressed bolts F in the usual manner.

Independent means are provided for imparting rotation to the drill steel C and in this instance the rotation motor is of the turbo type and preferably located at the rear of the cylinder casing and geared to the rotation sleeve D by a suitable driven Shaft G and train of gearing.

In accordance with this'invention and in order to conveniently mount the motor on the tool, the cylinder casing A is provided with a reduced extension H, bored to form a cylinder chamber, withln which the piston B reciprocates as indicated in Fig. 2, and the motor casing J is formed with a sleeve or collar portion K adapted to be removably mounted on the reduced cylinder extension H.

The motor casing J as shown in Fig. 3, is formed of substantially uniform section, without integral front and back heads, so that the motor casing itself, when removed from the tool or dismounted, is opened at front and back. In assembling the parts, the body of the cylinder casing A including the flange L thereon, forms the front head of the motor and the meeting surfaces of the motor casing and'cylinder flange form a pressure tight joint. The back head 0 of the cylinder extends over the motor casing J and also forms the back head for the motor, the meeting surfaces producing a pressure tight goint. The motor casing an back head are secured to the c linder casing A as by means of the bolts One of the advantages of constructing the motor casing in the manner described resides in the fact that interior corners are avoided in casting the parts, smooth plane surfaces for machining are produced and tight joints are formed between the parts. The motor casing occupies the minimum of space and is accurately centered and alined inposition upon the tool.

The operative parts of the motor comprises the two spur gears Q, and R inclosed within the casing J and suitably mounted to be driven by motive fluid which is admitted to the motor through the inlet S and through the passage T in the back head. The opening of the passage T in the back head is shown i dot and dash lines in Fig. 3 to indicate its relative position although this opening is in a portion cut way due to the section on which Fig. 3 is taken. The exhaust outlet U for the motor casing communicates with the chamber V in the c and 1s also provided cylinder casing A through which the driven shaft G passes and this chamber communicates with the atmosphere through the small openings By this means the noise and screech of the motor is substantially eliminated.

he gear Q, ismounted on the spindle X which has a bearing at Y in the cylinder flange L and extends at the other end through the back head 0 in the form of a bolt to hold the ings Z are provided for the gear Q and the spindle X 1s formed with a circular flange an adapted to fit a countersunk portion of the centering plate 6, secured to the back head and being slightly larger in diameter than the gear Q so that the gear has a running clearance in the motor casing J.

The gear R as shown, is suitably keyed to I thedriven shaft G as by means of the key with roller bearings stud e which extends O in the form of a The stud e is provided with a flange engagingla counter-sunk portion of the centering plate 9 which is secured the back head 0 and like the plate 6 is slightly larger in diameter than the gear B so that this gear also has a running clearance in the motor casing.

Rotation of the gears Q and R actuates the driven shaft G which is guided at its forward end by the roller bearings h. The shaft G carries a pinion j meshing with a having a pinion 0 meshing with the on the rotation sleeve D so that rotation is imparted to the said sleeve and to the drill steel C. I

9 indicates the usual water pipe or conduit extending through the piston 13 and 1" represents the water head which may be of any suitable or usual construction.

The parts of the rotation motor may be readily and quickly assembled, and may be cooperating with the through the back head bolt.

disassembled by loosening the bolts P, without removing the nuts 8 on the spindles X and e carrying the gears. In assembling the parts the gears are accurately centered with a minimum of parts.

I claim:

1. A fluid actuated percussive tool having a cylinder and a'piston adapted to operate therein, and a motor operatively connected to rotate the drill steel, said cyliner having a reduced extension at one end, said motor having a casing provided" with a sleeve portion adapted to be removably mounted on the reduced extension of the cyl- 2. A fluid actuated percussive tool having a cylinder and a piston adapted to operate therein, and a motor operatively connected to rotate the drill steel, said cylinder having a reduced extension at the back end, said motor having a casing provided with a sleeve portion adapted to be removably mounted on the reduced extension of the cylinder, a flange on the cylinder thereby forming the front head of the motor casing, a back head for the cylinder also formmg the back head for the motor casing, and

means for clamping the motor casing and back head to the cylinder.

'3. A fluid actuated percussive tool having a cylinder and t erein, anda to rotate the drill stee said cylinder having a reduced extension at the back end, said motor having a casing of substantially uni form section formed with open ends at front and back and adapted to be closed by front and back head portions, said motor casing being provided with an integral sleeve portion adapted to he slipped over the said reduced extension on the cylinder so that a flange on the cylinder forms the front head of the motor back head for the cylinder also to motor casing and clamping said motor casing and back head to the cylinder.

4. A fluid actuated percussive tool having a cylinder and a plston adapted to operate tation sleeve therein for the drill steel, a motor at the back end of the tool operatively connected to rotate said rotation sleeve, said cylinder having a reduced back end, said motor having a casing provided with a sleeve portion adapted to be removably mounted on the reduced extension of the cylinder and a back head for the tool extending over both the cylinder and the motor casing.

5. A fluid actuated percussive tool having a cylinder and a piston adapted to operate herein, a front head for the cylinder, a rotation sleeve therein for the drill steel, a motor at the back end of back end, said motor vided with removably sion of the having a casing proa sleeve portion adapted to be mounted on the reduced extencylinder and a back head for the the cylinder and end, said motor having a casing of substantially uniform section without integral front and back heads and being provided with a sleeve portion adapted to he slipped over the reduced extension on the cylinder to hold the motor in position and alinement, a flange on the cylinder forming the front head of the motor casing, and a back head for the cylinder extending outwardly and forming the back head for the motor casing 10 and means for clamping the motor casing and back heed to the cylinder.

In testimony whereof, I have hereunto set my hand.

FRED M. SLATER. 

